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¿Remember the graphical representation of the DOM of a web page? It's like a represantion of a genealogical tree. Whatever is behind a node are children of that node and whatever is over a node is the parent of a node, beeing the <html> the big granpa of all elements without any parent ;-)
For example,
<html>
<body>
<p>Hi.. I'm a child of body, and body is a child of html... Body is my parent... html could be my granpa but I don't have to worry about that as there is not granpa function selection neither a granson selection or whatever..</p>
<p>Hi there... I 'm also a body's child and a sibling of the previous p element.. by the way.. I don't have children neither my brother</p>
</body>
</html>